Question

Assume the graph of a function of the form y=ycos(k(x-b)) is given below. Which of the following are possible values for a,k, and b?

Answer 1

a- a=4, k=1/2, b=-pi/4
b- a=2,k=4,b=pi/4
c- a=4,k=2,b=pi/4
d- a=4,k=2,and b=-pi/4

Answer 2

in your question, i'm assuming that second y is supposed to be an "a"....

Answer 3

I thought the same thing, but there is no a in the equation, which is part of why I can't figure it out.

Answer 4

according to the choices, i'm pretty sure it is an "a" ...

Answer 5

you can eliminate B

Answer 6

since the peiod is pi, k=2 because period=2pi/k

Answer 7

so your choices are either C or D....

Answer 8

So it depends on if b is negative or positive. I think its C?

Answer 9

you're right...:)